Illumination device and display device

Abstract

An illumination device is provided and includes a light guide; a light emitting unit facing the light guide; a wiring substrate provided on the light emitting unit; and a frame surrounding the light guide and the light emitting unit, wherein the wiring substrate has a first edge and a second edge which extend in the first direction, and a third edge which connects the first edge and the second edge, the frame has a fourth edge facing the third edge; the third edge and the fourth edge are spaced apart from each other and form a trench which communicates with an outside of the illumination device, and a length of the third edge and a length of the fourth edge along the trench are larger than a distance between the first edge and the second edge in a second direction intersecting the first direction.

What is claimed is: 
     
       1. An illumination device comprising:
 a light guide; 
 a light emitting unit facing the light guide; 
 a wiring substrate provided on the light emitting unit and electrically connected to the light emitting unit; and 
 a frame surrounding the light guide and the light emitting unit, wherein 
 the wiring substrate has a first edge and a second edge which extend in the first direction, and a third edge which connects the first edge and the second edge, 
 the frame has a fourth edge facing the third edge; 
 the third edge and the fourth edge are spaced apart from each other and form a trench which communicates with an outside of the illumination device, and 
 a length of the third edge and a length of the fourth edge along the trench are larger than a distance between the first edge and the second edge in a second direction intersecting the first direction. 
 
     
     
       2. The illumination device of  claim 1 , wherein
 the third edge comprises a convex portion projecting in the first direction as seen in plan view, 
 the fourth edge comprises a concave portion facing the convex portion as seen in plan view, and 
 a length of the convex portion in the first direction is greater than or equal to 0.3 mm. 
 
     
     
       3. The illumination device of  claim 1 , wherein
 the third edge comprises a convex portion projecting in the first direction as seen in plan view, 
 the fourth edge comprises a concave portion facing the convex portion as seen in plan view, 
 the frame comprises a rib including the concave portion, and 
 the rib and the wiring substrate are arranged in the first direction. 
 
     
     
       4. The illumination device of  claim 3 , wherein
 a length of the rib in the second direction is less than or equal to 2.0 mm, and 
 an area of an upper surface of the rib is greater than or equal to 0.9 mm 2  and less than or equal to 1.0 mm 2 . 
 
     
     
       5. The illumination device of  claim 3 , wherein
 the third edge includes a first portion, a second portion, a third portion, a fourth portion, a fifth portion and a sixth portion, 
 the first portion, the second portion, the third portion, the fourth portion, the fifth portion and the sixth portion are arranged in this order from inside to outside of the frame, and 
 the second portion, the third portion and the fourth portion form the convex portion located on a rib side in comparison with the first portion, the fifth portion and the sixth portion. 
 
     
     
       6. The illumination device of  claim 5 , wherein
 the third portion is curved so as to project toward the rib, and 
 a radius of curvature of the third portion is greater than or equal to 0.1 mm. 
 
     
     
       7. The illumination device of  claim 5 , wherein
 the first portion and the second portion linearly extend, and 
 a first angle between the first portion and the second portion is greater than or equal to 20 degrees. 
 
     
     
       8. The illumination device of  claim 5 , wherein
 the fourth portion and the fifth portion linearly extend, and 
 a second angle between the fourth portion and the fifth portion is greater than or equal to 80 degrees. 
 
     
     
       9. The illumination device of  claim 5 , wherein
 a first interval between the sixth portion and the rib is less than a second interval between the third portion and the rib. 
 
     
     
       10. The illumination device of  claim 9 , wherein
 the first interval is greater than or equal to 0.08 mm, and 
 the second interval is greater than or equal to 0.15 mm. 
 
     
     
       11. A display device comprising:
 an illumination device; and 
 a display panel overlapping the illumination device, wherein 
 the illumination device comprises:
 a light guide; 
 a light emitting unit facing the light guide; 
 a wiring substrate provided on the light emitting unit and electrically connected to the light emitting unit; and 
 a frame surrounding the light guide and the light emitting unit, wherein 
 the wiring substrate has a first edge and a second edge which extend in the first direction, and a third edge which connects the first edge and the second edge, 
 the frame has a fourth edge facing the third edge; 
 the third edge and the fourth edge are spaced apart from each other and form a trench which communicates with an outside of the illumination device, and 
 a length of the third edge and a length of the fourth edge along the trench are larger than a distance between the first edge and the second edge in a second direction intersecting the first direction. 
 
 
     
     
       12. The display device of  claim 11 , wherein
 the third edge comprises a convex portion projecting in the first direction as seen in plan view, 
 the fourth edge comprises a concave portion facing the convex portion as seen in plan view, and 
 a length of the convex portion in the first direction is greater than or equal to 0.3 mm. 
 
     
     
       13. The display device of  claim 11 , wherein
 the third edge comprises a convex portion projecting in the first direction as seen in plan view, 
 the fourth edge comprises a concave portion facing the convex portion as seen in plan view, 
 the frame comprises a rib including the concave portion, and 
 the rib and the wiring substrate are arranged in the first direction. 
 
     
     
       14. The display device of  claim 13 , wherein
 a length of the rib in the second direction is less than or equal to 2.0 mm, and 
 an area of an upper surface of the rib is greater than or equal to 0.9 mm 2  and less than or equal to 1.0 mm 2 . 
 
     
     
       15. The display device of  claim 13 , wherein
 the third edge includes a first portion, a second portion, a third portion, a fourth portion, a fifth portion and a sixth portion, 
 the first portion, the second portion, the third portion, the fourth portion, the fifth portion and the sixth portion are arranged in this order from inside to outside of the frame, and 
 the second portion, the third portion and the fourth portion form the convex portion located on a rib side in comparison with the first portion, the fifth portion and the sixth portion. 
 
     
     
       16. The display device of  claim 15 , wherein
 the third portion is curved so as to project toward the rib, and 
 a radius of curvature of the third portion is greater than or equal to 0.1 mm. 
 
     
     
       17. The display device of  claim 15 , wherein
 the first portion and the second portion linearly extend, and 
 a first angle between the first portion and the second portion is greater than or equal to 20 degrees. 
 
     
     
       18. The display device of  claim 15 , wherein
 the fourth portion and the fifth portion linearly extend, and 
 a second angle between the fourth portion and the fifth portion is greater than or equal to 80 degrees. 
 
     
     
       19. The display device of  claim 15 , wherein
 a first interval between the sixth portion and the rib is less than a second interval between the third portion and the rib. 
 
     
     
       20. The display device of  claim 19 , wherein
 the first interval is greater than or equal to 0.08 mm, and 
 the second interval is greater than or equal to 0.15 mm.